This picture is very good and I don't think that you need to improve this particular piece of art. I personally love sunsets and think that if you really done this on canvas I would get it as it is lovely piece of work. I will love to see more like to see more like this as I think this is a very beautiful, elegant, wonderful and picture full of technique. Please don't be discrouged by the public and there comments because they might not appreciate it the way others do. I love this picture so much that I will make it a favourite.
This is good too, just some comments. These colors are more sad on this picture than on the other. It is always good to not cut in half something if you can do that. (like the tree o the right). You should avoid it, and do your composition without it. If you`re concentrating on the tree on the left, again the diagonals, it is decreasing from left to right, this is sad, just like the colors in the left, but after that is increasing and there are some small trees, which can represent a little hope, and the warmer colors too saying, that we have some hope left, but only a little hope, because we all know that the sun is going down, so it won`t come back now, just in the morning, so we have to wait until than. This is another good picture of yours, keep shooting